There the wrinkled old NokomisNursed the little Hiawatha,Rocked him in his linden cradle,Bedded soft in moss and rushes,Safely bound with reindeer sinews;Stilled his fretful wail by saying,"Hush! the Naked Bear will hear thee!"

--Longfellow, Henry Wadsworth, 1807-1882

(Which should have been bleeding obvious, but nobody gets taught poetry at schools these days...)

Of course, the Ojibwe don't have a monopoly on disturbing lullaby imagery.

I remember one from my own youth that featured a baby in a cradle stuck at the top of a tree and being blown about by the wind. Then the bough breaks sending the baby, cradle and all, crashing down to an almost certain death. Comforting.